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R. E. COOPER ET AL GAS ANALYZING APPARATUS Filed Nov. 29

Nov. 20, 1923.

atented Nov. 20, i923.

ROBERT E. COOPER AND CHARLES O. SISLER, 0F SAULT STE. MARIE/ONTARIO,CANADA.

GAS-ANALYZING APPARATUS.

Application filed November 29, 1922. Serial No. ($3,982.

T 0 all whom it may concern.

Be it known that we, ROBERT E. Coornn and CHARLES O. SIsLER, both of thecity of Sault St. Marie, in the Province of Ontario, Canada, citizens ofthe United States of America, have invented certain new and usefulImprovements in Gas-Analyzing Apparatus, of which the following is aspecification.

Thisinvention relates to means for determining from time to time, orcontinuously, the proportion of a given gas in a mixture of gasses suchas pass off heating, roasting reducing furnaces and the like, and myobject is to devise apparatus for obtaining such determinationselectrically so that indicating, recording or alarm apparatus may bereadily actuated and at a distant point if desired.

\Ve attain our object by withdrawing from a conduit in which the mixedgasses are flowing a certain proportion of the mixture, preferablycontinuously and by the siphon action of water or other liquid capableof dissolving the gas the proportion of which it is desired todetermine. The gases and liquid are intermingled and the liquid takes upthe soluble gas and the electrical conductivity of the liquid is thuschanged. The solution passes into an electrolytic cell in which aconstant level is maintained and in connection with which there isprovided means for determinin the changes in the electrical conductivity0 the solution as and when they occur. Such changes form a measure ofthe proportion of the specific gas in the mixture. These changes inconductivity in a circuit in which a current is flowing are employed toactuate suitable indicating, recording or alarm mechanism.

The invention is hereinafter more specifically described and isillustrated in the accompanying drawing which is a diagrammatic view ofthe apparatus.

In the drawing 1 is a conduit through which a mixture of gases ispassing. From this conduit a pipe 2 leads to an aspirator 3 of ordinarytype. To this aspirator leads a water pipe 4, which is preferablyconnected with a constant level tank wherebya constant pressure of wateris obtained when the apparatus is in operation. The tank is providedwith a supply pipe 6, which, when the apparatus is in use, would beconnected with a constant source of water supply. A control valve 7 ispreferably provided in the water supply pipe. The constant level in thetank is maintained through the medium of an overflow, which ispreferably a pipe 8 communicating with the interior of the tank belowits rim.

The water pipe leading to the aspirator is preferably provided with acontrol valve 9, and the gas supply pipe is preferably provided with apressure gauge such as the manometer 10 whereby the gas pressure can beobserved. A discharge pipe 11 from the aspirator leads to anelectrolytic cell 12, which is provided with an overflow such as thepipe 13 whereby a constant level may be maintained in the cell.

Electrodes 14 are suitably supported from the cover of the cell at asuitable distance apart. From the construction described it follows thatas long as there is a flow of gas in the conduit 1, a definiteproportion of the gas flowing may be drawn off by the action of theaspirator and intimately mixed, while passing through the aspirator andthe discharge pipe, with the water so that the soluble constituents ofthe gas mixture are absorbed by the water which ultimately reaches theelectrolytic cell.

The electrodes of the cell are connected in an electric circuit 15,which includes a suitable source of supply of electric energy, and alsosuitable means, actuated by variations in the current flowing, toindicate or record such variations or to cause them to sound an alarm.

The energy supplied to the circuit is constant, but as the conductivityof the electrolyte in the cell 12 varies according to the proportion ofgas which is held in solution therein, the current flowing in thecircuit will vary as the conductivity of the electrolyte varies. Weindicate a millimeter 16 in the circuit 15, the pointer of which willgive a measure at any time of the conductivity of the electrolyte andtherefore of the quantity or proportion of soluble gas in thelectrolyte.

We do not desire to confine ourselves to the specific arrangement shown,as variations in the conductivity of the electrolyte are readilyascertained by such devices, as, for example, a Wheatstone bridge.

Once having obtained a circuit 'n which the current'flowing varies inproportion to the s dissolved in the electrolyte, it is analyzed may besubstituted for the water.

What we claim as our invention is 1. Gas analyzing apparatus comprisingmeans for continuously withdrawing at a constant rate a small portion ofgas from a gas mixture from a conduit in which said mixture is flowingand bringing it into intimate contact with a liquid supplied at aconstant rate and at a constant ratio relative to the gas and capable ofabsorbing one of the components of the gas mixture; an electrolytic cellinto which the sampling means discharges and which is provided with anoverflow; and means for continuously determining the changes which takeplace in the electric conductivity of the liquid in the cell.

2. Gas analyzing apparatus comprising an aspirator; a gas supply pipe tosaid'aspirator; a water supply pipe to said aspirator; a discharge ipefrom said aspirator; an electrolytic ce 1 to which said discharge pipeleads and which is provided with an overflow; and means for continuouslydetermining the changes which take place in the electric conductivity ofthe liquid in the cell.

3. Gas analyzing apparatus comprising an aspirator; a gas supply pipe tosaid aspirator; a pressure gauge in said pipe; a water supply pipe tosaid aspirator; a discharge pipe from said aspirator; an electrol ticcell to which said'discharge pipe lea s and which is provided with anoverflowyand means for continuously determining the changes which takeplace in the electric conductivit of the liquid in the cell.

4. Gas analyzing apparatus comprising anaspirato-r; a gas supply pipe tosaid aspirator; a water supply pipe to said aspirator; a constant levelwater tank to which said supply pipe is connected; a discharge pipe fromsaid aspirator; an electrolytic cell to which said discharge pipe leadsand which is provided with an overflow; and means for continuouslydetermining the changes which take place 'in the electric conductivityof the liquid in the cell.

5. Gas analyzing apparatus comprising an aspirator; a gas supply pipe tosaid aspirator; a pressure gauge in said pipe; 21 Water supply pipe tosaid aspirator; a constant level water tank to which said supply pipe isconnected; a discharge pipe from said aspirator; an electrolytic cell towhich said discharge pipe leads and which is provided with an overflow;and means for continuously determining the changes which take place inthe electric conductivity of the liquid in the cell.

Signed at Sault Ste. Marie, Ont., Canada this 13th day of Nov., 1922.

ROBERT E. COOPER. CHARLES O. SI'SLER.

